I have a Meanwell RPT-75 with +5/+15V/-15V outputs.
I'm trying to increase the +/-15V outputs to +/-17V.
You can see in the block diagram attached that like pretty much all the off-the-shelf multi-output SMPS it uses a common switching FET and single (multiwound) flyback transformer.
The feedback is tapped off of the 5V output, and when I adjust the trimmer for the divider (the unit has a trimmer) I can get a decent range from the +5V output but not too much from the +/-15V outputs.
1) Is is possible to modify the feedback to come from the +15V output instead of the +5V output?
2) In general, is it reasonable to expect to be able to increase the +/-15V output voltages by up to 15%? (I don't care about changes in current rating there's tons of overhead)
3) Are the output voltages very much tied to the specs (windings) of the flyback transformer?
FYI, if it helps I traced the unit and it uses the following parts:
- switching FET: 2SK3878
- controller: NCP1203P60G
- shunt reference: TLV431
- optos: PC123
I'm trying to increase the +/-15V outputs to +/-17V.
You can see in the block diagram attached that like pretty much all the off-the-shelf multi-output SMPS it uses a common switching FET and single (multiwound) flyback transformer.
The feedback is tapped off of the 5V output, and when I adjust the trimmer for the divider (the unit has a trimmer) I can get a decent range from the +5V output but not too much from the +/-15V outputs.
1) Is is possible to modify the feedback to come from the +15V output instead of the +5V output?
2) In general, is it reasonable to expect to be able to increase the +/-15V output voltages by up to 15%? (I don't care about changes in current rating there's tons of overhead)
3) Are the output voltages very much tied to the specs (windings) of the flyback transformer?
FYI, if it helps I traced the unit and it uses the following parts:
- switching FET: 2SK3878
- controller: NCP1203P60G
- shunt reference: TLV431
- optos: PC123